小麦是需氮较多的作物,增施氮肥对提高小麦产量起着重要作用。但在生产实践中,往往因施用不当而未能增产,甚至造成减产。近几年来,为了提高氮肥经济效益,在淮北平原的汝南县等地,对氮肥的增产效和经应济用量进行了试验研究。材料和方法试验在亩施P_2O_5(以下简称p)8.16斤/亩基础上,设氮素用量为CK、N_4、N_8、 Wheat is a crop requiring more nitrogen, and increasing nitrogen fertilizer plays an important role in increasing wheat yield. However, in production practice, they often fail to increase production due to improper application and even reduce their production. In recent years, in order to improve the economic efficiency of nitrogen fertilizer, Runan County and other places in the Huaibei Plain, nitrogen fertilizer production efficiency and the amount of economic use of the experimental study. Materials and methods Test In the Mushi Shi P_2O_5 (hereinafter referred to as p) 8.16 kg / mu, based on the nitrogen content of CK, N_4, N_8,